This 25-foot tall "R" is situated on more of a slope than a hill, making it somewhat difficult to get a decent shot of it. But it is there, nonetheless. Just a few short miles north of Rock Springs, Wyoming.

The Flatirons are rock formations near Boulder, Colorado. The third Flatiron bore a "CU," for the University of Colorado, in 50-foot white letters from the 1950s until 1980, when it was painted over. The letters are still faintly visible.

High on a hill overlooking Manhattan, they're hard to miss. Engineering students plotted the 80-foot-tall "K" in 1921 and later added the "S" on K-Hill. The "U" was never added, but students still whitewash the letters every year.
Call Hall